PrivatePDF

Turn a PDF into a booklet

Printing a document two pages to a sheet and folding it does not give you a booklet — it gives you a stack that reads 1, 3, 5. A real booklet needs the pages reordered first, so that sheet one carries the last page and the first page side by side, sheet two carries the second and second-to-last, and so on inward. That reordering is called imposition, almost nothing outside a print shop does it, and it is all this tool does. Print the result double-sided, fold once, staple the fold.

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How it works

  1. 01Open the PDF.
  2. 02Check the panel: how many sheets, what paper they need, and how many blanks will be added.
  3. 03Set a signature size if the document is thick — a booklet of more than about twenty sheets will not fold cleanly.
  4. 04Export, then print double-sided, flipping on the SHORT edge.

What the imposition actually does

For an eight-page document the four printed sides come out as 8 and 1, then 2 and 7, then 6 and 3, then 4 and 5. Stack the sheets, fold through the middle, and the pages fall into order. Every page count is handled, not just multiples of four: a booklet needs four pages to a sheet, so blanks are added at the end, where a reader expects them, and the panel says how many before you export.

Thick documents need several booklets

Folding forty sheets together does not work — the fold bulges, the inner pages creep out past the outer ones, and a stapler will not reach. The answer bookbinders use is signatures: several thinner booklets, folded and stapled separately, then stacked. Set a sheet count per booklet and the document is split into signatures, each of which reads correctly on its own. The panel warns you when a document is thick enough to need this.

Flip on the short edge

This is the step people get wrong, and it is worth saying plainly because the resulting file is correct and there is nothing to debug. Booklet sheets are landscape; printing them double-sided with the long-edge flip that most drivers default to turns every second side upside down. Short-edge flip is what you want. If your first attempt comes out with alternating upside-down pages, that is the setting — not the imposition.

Binding and the fold

A gap at the fold shrinks each page slightly away from the centre, leaving room for the binding to eat without cropping anything — pages are always contained, never trimmed to fill. Binding on the right mirrors each sheet for a right-to-left language. Both are applied when you export, so the editor keeps showing you the pages themselves rather than the sheets.

Questions

What paper do I need?
Two pages side by side, so A4 pages make A3 landscape sheets and Letter pages make Tabloid landscape. The panel names the size for your document, including when it is not a standard one.
Why not just use my printer’s booklet setting?
Use it if you have it and it works. Many drivers do not offer one, it is often unavailable when printing to PDF, and it cannot be used at all when you are sending the file to someone else to print. Imposing the file itself means the ordering travels with the document.
My document is not a multiple of four pages.
That is fine and normal. Blank pages are added at the end to fill the last sheet, and the panel tells you how many beforehand.
Is the file uploaded to be imposed?
No. The reordering and the sheet building happen in your browser.